I rode a disk drive back in the day. at 1 of the plymouth grundig world cups ned overends specialized ultimate was on a bike stand in the specialized tent. I spun the back wheel & couldnt believe how loud it was. looking through the disk drive via the inner tube valve access hole (he was riding Sugino, but essentially the same) I could see he was using a hugi hub. a few months later I had a hugi hub in a disk drive pro. it sounded amazing. some people hate a loud freehub, while others lov it. a hugi in a disk drive is likely the loudest combination ever.
as mike has stated, they're not reliable. as soon as the cord looses tension via a single rock strike, overly hard landing, or just sand & dirt getting into the hub connection area & slowly abrading the cord it'll fail. if you're lucky it'll be central park plymouth having a dual slalom race with your friends (mine), or unlucky in the middle of dartmoor (my friend seth).
I still own disk drives, but these days their use is limited to a few chilling rides a year. just to remind me of how cool they sound, fingers crossed at all times hoping it doesnt grenade